[Toby Hinger] “I encoded the audio using SoundConverter.”
Why not use the audio encoding offered by BitVice? There are a number of options available (look in the Preferences settings).
[Toby Hinger] “Next I tried exporting the video in Apple Intermediate codec. “
Apple Intermediate codec is not a good choice – an old codec. The Animation codec is a good choice for your purposes. It’s lossless so your results will be as good as your source, but yes, the file size is something you have to deal with.
HTH
Gary